Thomas I have same model . have 3 manuals w114/115 . Mercedes electrical troubleshooting manual . doesn't cover radio / power antenna this f20 fuse box trying to trouble shoot .mounted on lreft enginr firewall behind main fuse . need a picture ? because in manual says if theres a dotted line around a circuit such as this fuse box means could be mounted elsewhere. looks like a have power antenna wires running to this f20 prefusebox. in manual says aux fanfuse ??? if you need any info fr the manuals let me know